A method comprising introducing CO2 into thermal water (2) in an underground reservoir (3) designated and suitable for the geothermal generation of energy, wherein the CO2 is discharged from a nozzle (4) and introduced into the thermal water (2) at a discharge flow velocity, wherein the discharge flow velocityis above a lower limit value which is selected in such a way that backflow of the thermal water (2) into the nozzle (4) is prevented, andis below an upper limit value which is selected in such a way that stripping of CO2 dissolved in the thermal water (2) is prevented.展开▼